What are the ethical and legal issues of self driving cars being released in the UK?
LEGAL
Legislative:
http://cyberlaw.stanford.edu/wiki/index.php/Automated_Driving:_Legislative_and_Regulatory_Action
http://www.ncsl.org/research/transportation/autonomous-vehicles-self-driving-vehicles-enacted-legislation.aspx
http://spectrum.ieee.org/transportation/advanced-cars/selfdriving-cars-will-be-ready-before-our-laws-are
Liability:
https://www.usatoday.com/story/money/cars/2017/04/03/tesla-mishap-raises-issues-self-driving-liability/99880620/
https://www.nytimes.com/2014/05/14/upshot/when-driverless-cars-break-the-law.html?_r=0
Regulation:
https://www.theverge.com/2016/9/19/12981448/self-driving-car-guidelines-obama-foxx-dot-nhtsa
Law Review
https://www.americanbar.org/publications/youraba/2015/october-2015/are-we-there-yet--the-legal-aspects-of-driverless-cars.html
ETHICAL
https://www.technologyreview.com/s/542626/why-self-driving-cars-must-be-programmed-to-kill/
https://www.scientificamerican.com/article/driverless-cars-will-face-moral-dilemmas/
http://news.stanford.edu/2017/05/22/stanford-scholars-researchers-discuss-key-ethical-questions-self-driving-cars-present/

This should be enough to get you started.  (In terms of how it may apply in the UK, I leave that for you to determine;)